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65-series covers relative safe handling & braking (in all conditions), plus not unreasonable FE.
Mercedes was equipping their sedans with such in the early 1970s. American cars, even with radials (a few years later) were still on 75-series tires. 78 on one of our cars.
Was hard to make the argument about noise, ride, etc, since suspension tuning was what was lacking.
I’ve not ever seen 60-series and wider do anything for FE. Like the the 60-mph aero wall, 65’s are the end of the pursuit of “wider” (as with “faster”; one needs to apply tools never used to chase higher speeds to understand compromise).
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